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View Diary: Traffic Cameras: Don't watch me, bro! (97 comments)

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  •  Loop detectors can be adjusted to detect bikes (0+ / 0-)

    Bowling alley-style video detection requires more maintenance, according to a 2005 study:

    Each video detection system showed a moderate to high number of missed and false calls over the two test periods.
    The loop detector showed only one missed call and 1 false call over both 48 hour test periods. The missed call was due to a wild vehicle path, while the false call was due to an unexplained eight-second extension.
    None of the three systems appeared to provide superior performance over the other three. The most accurate and reliable technology was the traditional loop detectors.
    The accuracy of all three systems appears to degrade with time and it appeared that a re-calibration was necessary only four months after the initial installation by factory representatives.
    If I were in charge, I'd use loop detectors if a traffic light is installed when a road is built/widened, and cameras as a stopgap between when a signal is added and the next repaving.

    Anyway, if they really wanted to, they could probably compile a database of cars based on exactly how much current is generated by the loop. Spies gonna spy.

    warning: snark probably above

    by NE2 on Fri Nov 22, 2013 at 03:33:30 PM PST

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